JavaTM 2 Platform
Standard Ed. 5.0

javax.crypto.spec
Class DESedeKeySpec

java.lang.Object
  extended by javax.crypto.spec.DESedeKeySpec
All Implemented Interfaces:
KeySpec

public class DESedeKeySpec
extends Object
implements KeySpec

This class specifies a DES-EDE ("triple-DES") key.

Since:
1.4

Field Summary
static int DES_EDE_KEY_LEN
          The constant which defines the length of a DESede key in bytes.
 
Constructor Summary
DESedeKeySpec(byte[] key)
          Creates a DESedeKeySpec object using the first 24 bytes in key as the key material for the DES-EDE key.
DESedeKeySpec(byte[] key, int offset)
          Creates a DESedeKeySpec object using the first 24 bytes in key, beginning at offset inclusive, as the key material for the DES-EDE key.
 
Method Summary
 byte[] getKey()
          Returns the DES-EDE key.
static boolean isParityAdjusted(byte[] key, int offset)
          Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DES_EDE_KEY_LEN

public static final int DES_EDE_KEY_LEN
The constant which defines the length of a DESede key in bytes.

See Also:
Constant Field Values
Constructor Detail

DESedeKeySpec

public DESedeKeySpec(byte[] key)
              throws InvalidKeyException
Creates a DESedeKeySpec object using the first 24 bytes in key as the key material for the DES-EDE key.

The bytes that constitute the DES-EDE key are those between key[0] and key[23] inclusive

Parameters:
key - the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification.
Throws:
NullPointerException - if key is null.
InvalidKeyException - if the given key material is shorter than 24 bytes.

DESedeKeySpec

public DESedeKeySpec(byte[] key,
                     int offset)
              throws InvalidKeyException
Creates a DESedeKeySpec object using the first 24 bytes in key, beginning at offset inclusive, as the key material for the DES-EDE key.

The bytes that constitute the DES-EDE key are those between key[offset] and key[offset+23] inclusive.

Parameters:
key - the buffer with the DES-EDE key material. The first 24 bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.
offset - the offset in key, where the DES-EDE key material starts.
Throws:
NullPointerException - if key is null.
InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes
Method Detail

getKey

public byte[] getKey()
Returns the DES-EDE key.

Returns:
the DES-EDE key. Returns a new array each time this method is called.

isParityAdjusted

public static boolean isParityAdjusted(byte[] key,
                                       int offset)
                                throws InvalidKeyException
Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.

Parameters:
key - a byte array which holds the key value
offset - the offset into the byte array
Returns:
true if the given DES-EDE key is parity-adjusted, false otherwise
Throws:
NullPointerException - if key is null.
InvalidKeyException - if the given key material, starting at offset inclusive, is shorter than 24 bytes

JavaTM 2 Platform
Standard Ed. 5.0

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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